I've got adults who went outside last July at about 5-6 weeks old. Overnight temps in July are in the 50s+ here in WA. No heat lamp.
My 2 "tweens" went outside last weekend. They're fully feathered & 7 weeks old. Overnight temps are in the 40s now. No heat lamp. I did notice that they seemed cold when it rained the other day, so I brought them onto our utility porch to warm up for an hour or so. Then, back outside. They huddle and stay warm enough overnight.
My newest batch of chicks is 4 days old. They will go outside permanently in a few weeks. If the weather is nice this weekend ("nice" = 60+) I'll take them outside for their first outing for maybe 20-30 minutes, or until they let me know they're ready to go inside.
My 2 "tweens" went outside last weekend. They're fully feathered & 7 weeks old. Overnight temps are in the 40s now. No heat lamp. I did notice that they seemed cold when it rained the other day, so I brought them onto our utility porch to warm up for an hour or so. Then, back outside. They huddle and stay warm enough overnight.
My newest batch of chicks is 4 days old. They will go outside permanently in a few weeks. If the weather is nice this weekend ("nice" = 60+) I'll take them outside for their first outing for maybe 20-30 minutes, or until they let me know they're ready to go inside.